Abstract
Optical absorption spectra of solvated electrons in ammonia, methylamine, and three of their mixtures have been obtained at three different temperatures by extrapolating spectra of dilute lithium solutions to infinite dilution in metal. The solvated electron spectra in the pure solvents and in each of the mixed solvents display shape stability as temperature is changed. Values of half-height width, position of maximum absorbance, and its temperature coefficient in the mixed solvents are between the values of the corresponding quantities in the two pure solvents. Application of a two-absorber model analysis, factor analysis, and also the Gram-Schmidt procedure show that all of the solvated electron spectra in mixtures of ammonia and methylamine are representable in terms of a small number of linearly independent absorption bands as long as these absorption bands are presumed to shift with changing conditions, i.e., changing temperature and/or solvent composition. For all spectra at different temperatures for a fixed solvent composition the number of such shifted absorption bands turns out to be just one. For all spectra at both different temperatures and different solvent compositions the number of such shifted absorption bands does not exceed three.